Bosch Rexroth Multi-Turn Absolute Encoder
Model: GDM2.1-2048-14V-H12,0
ID No: 827 040-09
Material No. (P/N): R911323380 (for the GDM02.1 family)
1. General Description
The Rexroth GDM2.1 is a robust multi-turn absolute encoder, designed for providing precise position and speed feedback in demanding industrial automation systems, particularly for Rexroth IndraDrive servo motors. It provides an absolute position value for every shaft position, even after a power cycle, by tracking both the single-turn position and the number of revolutions.
This model features a hollow shaft for direct mounting onto a motor shaft, a high-resolution optical scanning system, and a 17-pin M17 connector for power and data communication with the drive.
Key Features 🎯
- Absolute Multi-Turn: Provides unique position data for every shaft position and revolution. No homing is required on power-up.
- High Resolution: Features 2048 increments per revolution (11-bit single-turn).
- Multi-Turn Tracking: Tracks 4096 revolutions (12-bit multi-turn), for a total resolution of 23 bits.
- Hollow Shaft Design: 12.0 mm hollow shaft for integrated motor feedback.
- Digital Interface: Uses a high-speed digital interface for communication with the drive (e.g., Rexroth proprietary, SSI, or EnDat).
- Robust Housing: Durable metal housing with a high protection rating (IP67) for industrial use.
2. Technical Specifications
Electrical & Performance Data
| Parameter | Value |
| Encoder Type | Multi-Turn Absolute Encoder |
| Single-Turn Resolution | 2048 increments (11 Bit) |
| Multi-Turn Resolution | 4096 revolutions (12 Bit) |
| Total Resolution | 23 Bit |
| Supply Voltage | 14 VDC (Nominal, supplied by drive) |
| Interface | Digital Serial (e.g., ACURO®link, EnDat 2.2) |
Mechanical & Environmental Data
| Parameter | Value |
| Shaft Type | Hollow Shaft (12.0 mm) |
| Connection | 17-pin M17 Flange Socket |
| Protection Class | IP67 (Housing) |
| Max. Speed | 6,000 RPM (Typical) |
| Operating Temp. | 0°C to +105°C |
3. Connection (Typical 17-Pin M17 Pinout)
This encoder uses a 17-pin connector for communication and power. The pinout is specific to the Rexroth drive system it connects to. Below is a typical pin assignment for Rexroth digital encoders.
| Pin | Signal | Description |
| 1 | Data + | Serial Data + (RS-485) |
| 2 | Data – | Serial Data – (RS-485) |
| 3 | Clock + | Clock Signal + (RS-485) |
| 4 | Clock – | Clock Signal – (RS-485) |
| 5 | +V (Sensor) | Voltage Supply (e.g., 14V) |
| 6 | GND (Sensor) | Ground for Supply |
| … | … | … |
| 16 | T+ | Motor Temp Sensor + |
| 17 | T- | Motor Temp Sensor – |
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